參數(shù)資料
型號： HCPL-7870
英文描述： Isolated 15-bit A/D Converter(隔離15位A/D轉(zhuǎn)換器)
中文描述： 隔離15位A / D轉(zhuǎn)換器（隔離15位的A / D轉(zhuǎn)換器）
文件頁數(shù)： 26/30頁
文件大?。?/td> 344K
代理商： HCPL-7870
26
Analog Interfacing
Power Supplies and
Bypassing
The recommended application
circuit is shown in Figure 21. A
floating power supply (which in
many applications could be the
same supply that is used to drive
the high-side power transistor) is
regulated to 5 V using a simple
zener diode (D1); the value of
resistor R1 should be chosen to
supply sufficient current from the
existing floating supply. The
voltage from the current sensing
resistor or shunt (Rsense) is
applied to the input of the HCPL-
7860 (U2) through an RC anti-
aliasing filter (R2 and C2). And
finally, the output clock and data
of the isolated modulator are
connected to the digital interface
IC. Although the application
circuit is relatively simple, a few
recommendations should be
followed to ensure optimal
performance.
The power supply for the isolated
modulator is most often obtained
from the same supply used to
power the power transistor gate
drive circuit. If a dedicated
supply is required, in many cases
it is possible to add an additional
winding on an existing trans-
former. Otherwise, some sort of
simple isolated supply can be
used, such as a line powered
transformer or a high-frequency
DC-DC converter.
An inexpensive 78L05 three-
terminal regulator can also be
used to reduce the floating supply
voltage to 5 V. To help attenuate
high-frequency power supply
noise or ripple, a resistor or
inductor can be used in series
with the input of the regulator to
form a low-pass filter with the
regulator’s input bypass
capacitor.
As shown in Figure 21, 0.1
μ
F
bypass capacitors (C1 and C3)
should be located as close as
possible to the input and output
power-supply pins of the isolated
modulator (U2). The bypass
capacitors are required because
of the high-speed digital nature of
the signals inside the isolated
modulator. A 0.01
μ
F bypass
capacitor (C2) is also recom-
mended at the input due to the
switched-capacitor nature of the
input circuit. The input bypass
capacitor also forms part of the
anti-aliasing filter, which is
recommended to prevent high-
frequency noise from aliasing
down to lower frequencies and
interfering with the input signal.
PC Board Layout
The design of the printed circuit
board (PCB) should follow good
layout practices, such as keeping
bypass capacitors close to the
supply pins, keeping output
signals away from input signals,
the use of ground and power
planes, etc. In addition, the layout
of the PCB can also affect the
isolation transient immunity
(CMR) of the isolated modulator,
due primarily to stray capacitive
coupling between the input and
the output circuits. To obtain
optimal CMR performance, the
layout of the PC board should
minimize any stray coupling by
maintaining the maximum
possible distance between the
input and output sides of the
circuit and ensuring
Figure 21. Recommended Application Circuit.
+
-
MOTOR
HV-
HV+
R
SENSE
FLOATING
POSITIVE
SUPPLY
GATE DRIVE
CIRCUIT
V
DD1
V
IN+
V
IN-
GND1
V
DD2
MCLK
MDAT
GND2
CDAT
SCLK
CCLK
V
DD
CHAN
CLAT
MCLK1
SDAT
MDAT1
CS
MCLK2
THR1
MDAT2
OVR1
GND
RESET
+ 5 V
HCPL-7860/
HCPL-786J
TO
CONTROL
CIRCUIT
C3
0.1 μF
C1
0.1 μF
C2
0.01 μF
R2 39
R1
D1
5.1 V
HCPL-X870
相關PDF資料
PDF描述
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相關代理商/技術參數(shù)
參數(shù)描述
HCPL-788J 功能描述:隔離放大器 4.5 - 5.5 SV RoHS:否 制造商:Texas Instruments 輸入補償電壓:1.5 mV 共模抑制比（最小值）:95 dB 帶寬:60 KHz 工作電源電壓:3.3 V 電源電流:8 mA 工作溫度范圍:- 40 C to + 105 C 安裝風格:SMD/SMT 封裝 / 箱體:SOP-8 封裝:Tube
HCPL-788J#500 功能描述:隔離放大器 4.5 - 5.5 SV RoHS:否 制造商:Texas Instruments 輸入補償電壓:1.5 mV 共模抑制比（最小值）:95 dB 帶寬:60 KHz 工作電源電壓:3.3 V 電源電流:8 mA 工作溫度范圍:- 40 C to + 105 C 安裝風格:SMD/SMT 封裝 / 箱體:SOP-8 封裝:Tube
HCPL-788J/EVAL 制造商:Avago Technologies 功能描述:
HCPL-788J-000E 功能描述:隔離放大器 4.5 - 5.5 SV RoHS:否 制造商:Texas Instruments 輸入補償電壓:1.5 mV 共模抑制比（最小值）:95 dB 帶寬:60 KHz 工作電源電壓:3.3 V 電源電流:8 mA 工作溫度范圍:- 40 C to + 105 C 安裝風格:SMD/SMT 封裝 / 箱體:SOP-8 封裝:Tube
HCPL-788J-500E 功能描述:隔離放大器 4.5 - 5.5 SV RoHS:否 制造商:Texas Instruments 輸入補償電壓:1.5 mV 共模抑制比（最小值）:95 dB 帶寬:60 KHz 工作電源電壓:3.3 V 電源電流:8 mA 工作溫度范圍:- 40 C to + 105 C 安裝風格:SMD/SMT 封裝 / 箱體:SOP-8 封裝:Tube
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